mixin php($contents)
  if $contents
    != '<?php '+ $contents +'; ?>'
  else
    != '<?php '
    block
    != ' ?>'

mixin if($condition)
  != '<?php if('+ $condition +') { ?>'
  block
  != '<?php } ?>'

mixin else($condition)
  != '<?php } ' + ($condition ? 'elseif('+ $condition +')' : 'else') + ' { ?>'
  block

mixin postloop()
  != '<?php while ( have_posts() ) : the_post(); ?>'
  block
  != '<?php endwhile; ?>'
